tree 2654345355dc871cd36456b6f40bb9f3e5aea899
parent 1c18c1cdd57b731a9672c6fb1ddcf86a13587713
author Asim Shankar <ashankar@google.com> 1412840317 -0700
committer Asim Shankar <ashankar@google.com> 1412840319 -0700

veyron/runtimes/google: Plumb the new security model all the way through.

This commit aims to enable a smooth transition to the new security
model for all client and server processes.
- ipc.Server implementations have both an old model identity
  (PrivateID/PublicID) and new model credentials (Principal)
  However, the IPC protocol version sent by the client determines
  which model to use. IPCVersion4 implies authentication with
  the new model, older versions use the older model
- The runtime sets up ipc.Client to use the new security model
  only when explicitly asked to do so via the presense of the
  VEYRON_CREDENTIALS environment variable.

The upgrade plan is to:
- Generate new-model credentials for all services and restart
  those services
- After some time (once we've traced all remaining old code),
  switch the default behavior to only use the old model if
  explicitly asked to do so.
- And after that, remove the old model

Change-Id: Ifcaee44dbf12fa8bdbeec6e241f3f9d232668273